JP3779839B2 - Inner stand type rolling mill - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In particular, the present invention relates to an inner sleeve type rolling mill of an electric resistance welded tube or a shaped steel that can perform a roll exchanging operation using a roll assembly.
[0002]
[Prior art]
Conventionally, as an inner stand type rolling mill used for the above-mentioned purpose, there is an inner stand type rolling mill previously presented by the present applicant in Japanese Patent Publication No. 58-55846.
In this inner stand type rolling mill, a movable carriage loaded with a roll assembly is pulled out of the forming stand installed on the ERW pipe production line (offline), and a new forming roll is incorporated instead. The assembled roll structure is transferred and set in a molding stand using another moving carriage so that the rolls of the molding roll are exchanged.
[0003]
In addition, the assembled roll structure is composed of an upper, lower horizontal roll, left, starboard roll, and an inner stand to which these rolls are assembled. After pulling up the upper roll from inside the inner stand, pull out the left and starboard rolls, then remove the inner stand on the moving carriage, finally lift and remove the lower roll, and then reverse the new forming roll In this order, it is assembled on the moving carriage.
[0004]
[Problems to be solved by the invention]
However, the above-described conventional inner stand type rolling mill is superior in formability because it uses the inner stand and the inner stand type rolling mill has high vertical and horizontal rigidity and averages, but the following problems to be solved Had.
In other words, since the inner stand is also configured to come off-line as a part of the assembled roll structure when the rolls are changed, the following problems have occurred.
(1) In order to shorten the roll reassignment time, a plurality of inner stands are required as operation spare parts for one rolling mill, which deteriorates the investment effect and requires a lot of space.
[0005]
(2) Since the rolls are taken out and taken in the gap between the narrow sliding portions from the inner stand offline, a plurality of skilled workers are required.
(3) Since there are a plurality of inner stands, it is necessary to increase the production accuracy of operation spare parts such as chock.
[0006]
The present invention has been made in view of such circumstances, and roll replacement work can be performed easily, quickly and while maintaining excellent points such as high rigidity and uniform rigidity in the vertical and horizontal directions of a conventional inner stand rolling mill. It is an object of the present invention to provide an inner stand type rolling mill that can be performed at low cost.
[0007]
[Means for Solving the Problems]
An inner stand type rolling mill according to the present invention that meets the above-mentioned object is a molding stand disposed on a production line of an electric resistance welded tube and a shaped steel, Said Built into the molding stand, Said Inner stand that has an opening on the side facing the roll exchange line arranged in a direction orthogonal to the production line of the ERW pipe and the shaped steel, and forms a portal frame in plan view, and upper and lower horizontal rolls And assembled from left and starboard rolls, Said Roll assembly position to be assembled inside the inner stand, Said A roll assembly movable between roll exchange positions on the roll exchange line; Said Open the opening of the inner stand, Said Roll assembly Said An upper position that allows entry into and removal from the inner stand; Said Close the opening of the inner stand and configure a rectangular rigid frame in plan view, Said Inner stand type rolling mill comprising a heel roll drive unit that is moved up and down between a lower position that allows one of the left and right heel rolls to be driven In the above, the eaves roll drive section is a roll drive that is slidably disposed in the up-down direction in the opening of the inner stand, and a roll drive that is attached to the elevating block and advances one of the left and right side rolls A motor and a holding piece that forms a pair that is integrally connected to both ends of the elevating block and whose inner surface slidably contacts the outer surface of both side walls forming the opening of the inner stand in the vertical direction. .
[0008]
Therefore, when replacing the roll, the roll drive unit is moved to the upper position to open the opening of the inner stand, and only the roll assembly that is automatically stacked in three stages in the rolling mill is taken out of the inner stand and is offline. It can be transferred to a roll exchange position by using a roll exchange line to perform roll exchange. After the roll replacement is completed, the roll assembly is again assembled into the inner stand using the roll replacement line, and automatically stacked in three stages in the rolling mill, and then the roll drive unit is lowered to the lower position. By closing the opening of the inner stand and forming a rectangular rigid frame having sufficient rigidity in a plan view, it is possible to form an electric resistance welded tube and a shaped steel by an inner stand type rolling mill.
[0009]
In the above configuration , The inner wall surface of the holding piece and the outer surfaces of both side walls may be in a wedge fitting state.
In this case, the rigidity of the inner stand can be increased by preventing deformation and backlash at the fitting portion.
In addition, a drive unit lifting device that lifts and lowers the eaves roll drive unit and a drive unit elevating guide for elevating the eaves roll drive unit are arranged above the opening of the inner stand, and the drive unit elevating guide and the opening of the inner stand A roll assembly body entry / exit space can be formed between the two. In this case, by driving the drive lifting device and moving the saddle roll drive unit upward, a sufficiently large roll assembly entry / exit space can be formed below the roll assembly drive unit. Work can be performed easily and reliably.
[0010]
Further, the inner stand can be taken out of the molding stand along the roll exchange line. In this case, even if the inner stand is damaged due to operation, the inner stand can be taken out of the molding stand without using a special jig during regular maintenance.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
[0012]
First, with reference to FIG.1 and FIG.2, the whole structure of the inner stand type rolling mill A which concerns on the 1st Embodiment of this invention is demonstrated.
As shown in the figure, a molding stand 11 is disposed on the electric sewing tube manufacturing line 10. An inner stand 12 is incorporated in the forming stand 11, and the inner stand 12 is a plane having an opening 14 on the side facing the roll exchange line 13 disposed in a direction orthogonal to the electric sewing tube manufacturing line 10. It forms a U-shaped gate-shaped frame.
[0013]
In the roll assembly position shown in FIG. 1, a saddle roll driving unit 20 described later is fitted into the opening 14, and the upper and lower horizontal rolls 15 and 16 and the left and right side are located inside the inner stand 12. A roll assembly 19 configured by assembling the rolls 17 and 18 is assembled.
The roll assembly 19 moves on the roll exchange line 13 from the roll assembly position shown in FIG. 1 to the roll exchange position shown in FIG. 2 by raising the scissors roll drive unit 20 and opening the opening 14. can do.
[0014]
Further, as shown in FIGS. 1 and 2, a reed roll drive unit 20 is disposed on the side of the inner stand 12 facing the roll exchange line 13.竪 The roll drive unit 20 has an upper position (see FIG. 7) that is an assembly insertion / removal position that allows the roll assembly 19 to be inserted into and removed from the inner stand 12 by opening the opening 14 of the inner stand 12. A rigid rectangular frame is formed in a plan view by closing the opening 14 of the stand 12 and is configured to be movable up and down between a lower position (see FIG. 3) that is a roll driving position capable of driving the port roll 17. .
[0015]
Next, the configuration of each part of the inner stand type rolling mill A having the above-described configuration will be specifically described.
As shown in FIGS. 3 to 5, the molding stand 11 includes four front and rear columns 22 erected at the corners of the rectangular shape on the base plate 21. At an intermediate height position on the inner surface of the pillar 22, an inner stand 12 made of a U-shaped gate frame in a plan view having an opening 14 on the side facing the roll exchange line 13 is attached. In the inner stand 12, a roll assembly 19 to be described later is disposed so as to freely enter and exit toward the roll exchange line 13.
[0016]
As shown in FIGS. 1 to 3, the inner stand 12 is formed by integrating the front and rear lateral plates 23 and 24 with the right ends of the front and rear lateral plates 23 and 24 before and after making a pair with a parallel interval in the front-rear direction. It is comprised by the coffin roll drive part 77 connected in general. Further, the left ends of the front and rear horizontally long plates 23 and 24 are connected to each other by a scissor roll driving unit 20 that can be moved up and down. And the heel roll drive part 20 is raised / lowered by the roll drive part raising / lowering apparatus (drive part raising / lowering apparatus) 25 provided in the upper part of the shaping | molding stand 11. FIG. The roll driving unit lifting device 25 will be described in detail later.
[0017]
The upper parts of the side pillars 22 are connected to each other by an upper horizontal frame 26. A suspension frame 27 is disposed in the upper part of the molding stand 11, and the central portion of the suspension frame 27 is an operation rod 29 of a roll chock suspension cylinder 28 placed on the center portion of the upper horizontal frame 26. It is connected to the lower end of the. Suspension hooks (not shown) that are detachably locked to locking projections 38a (see FIGS. 8 and 9) of an upper horizontal roll chock 38, which will be described later, are provided on both front and rear sides of the suspension frame 27. Installed. On the other hand, on the left and right sides of the upper horizontal frame 26, a rolling device 30 that is operated in synchronism with a rolling device driving motor 30a is placed. A rolling block 31 attached to the lower end of the rolling device 30 is The upper horizontal roll chock 38 is in pressure contact with the upper surface.
With the configuration described above, the upper horizontal roll 15 can be rolled down by the roll chock suspension cylinder 28.
[0018]
As shown in FIGS. 3 to 5, below the molding stand 11, a pair of press-up devices 33 that are driven in synchronization by a drive motor 32 are disposed. A ram 34 of each press-up device 33 is provided. Above, a lower surface of a lower horizontal roll chock 39, which will be described later, is placed and supported so as to be movable up and down.
As shown in FIG. 3, a rail elevating guide 35 is fixed to the lower portion of the inner stand 12 below the forming stand 11, and a pair of rails 36 are attached to the rail elevating guide 35 so as to be movable up and down. It has been. On the other hand, a rail elevating cylinder 37 that elevates and lowers the rail 36 is installed on the base plate 21. On the rail 36, the roll assembly 19 is placed so as to freely enter and exit from the inner stand 12 toward the roll exchange line 13.
[0019]
As shown in FIGS. 1 to 3, 8, and 9, the roll assembly 19 includes upper and lower horizontal rolls 15 and 16, left and starboard rolls 17 and 18, and upper and lower horizontal rolls 15 and 16. A pair that rotatably supports both shaft ends, and a left horizontal pair that supports the lower horizontal roll chocks 38 and 39 and the left and starboard rolls 17 and 18 rotatably. Starboard roll chock 40, 41.
In the above-described configuration, wheels 42 that can roll on the rail 36 are attached to the lower surfaces of the lower horizontal roll chock 39 that forms a pair. Therefore, the roll assembly 19 can enter and exit from the inner stand 12 toward the roll exchange line 13.
[0020]
As shown in FIG. 9, rod mounting surfaces 43 and 44 are formed at the four corners of the upper surface of the lower horizontal roll chock 39, and these rods are mounted at the time of off-line reassignment shown in FIG. On the surfaces 43 and 44, support rods 45 and 46 attached to the lower surfaces of the left and starboard roll chocks 40 and 41 are placed. Accordingly, as shown in FIG. 9A, the left and starboard roll chocks 40 and 41 can be supported on the lower horizontal roll chock 39 via the support rods 45 and 46 during the offline reassignment.
[0021]
Further, as shown in FIGS. 8 and 9, rod insertion portions 47 and 48 into which the support rods 45 and 46 fall are formed at positions away from the rod mounting surfaces 43 and 44 by a predetermined distance in the width direction. Yes. Accordingly, as shown in FIG. 9 (b), the left and starboard roll chock 40, 41 is moved inward to cause the support rods 45, 46 to fall into the rod insertion portions 47, 48, and the left, starboard roll chock. The lower surfaces of 40 and 41 can be supported in a stable state on a chock support surface 49 provided on the upper surface of the lower horizontal roll chock 39.
[0022]
On the other hand, as shown in FIGS. 8 and 9, rod abutment blocks 50 and 51 are formed in front and rear of the lower surface of the upper horizontal roll chock 38, and at the time of offline reassignment shown in FIG. These rod abutment blocks 50 and 51 are abutted and supported by support rods 52 and 53 attached to the upper surfaces of the left and starboard roll chocks 40 and 41, respectively. Therefore, as shown in FIG. 9A, the upper horizontal roll chock 38 can be supported on the left and starboard rolls 40 and 41 via the support rods 52 and 53 at the time of off-line reassignment.
[0023]
Further, as shown in FIGS. 8 and 9, rod insertion portions 54 and 55 into which the support rods 52 and 53 are respectively inserted are formed at positions separated from the rod contact blocks 50 and 51 by a predetermined distance in the width direction. ing. Accordingly, as shown in FIG. 9B, the left and starboard roll chocks 40 and 41 are moved inward to cause the support rods 52 and 53 to fall into the rod insertion portions 54 and 55, so that the upper horizontal roll chock 38 The lower surface can be stably supported on the chock support surface 56 provided on the upper surfaces of the left and starboard roll chocks 40 and 41.
[0024]
Next, the roll drive unit elevating device 25 used for raising and lowering the eaves roll drive unit 20 and the eaves roll drive unit 20 will be described with reference to FIGS.
As shown in FIGS. 3 and 4, the eaves roll drive unit 20 includes a horizontally long elevating block 57 extending in the front-rear direction, and an advancing / retreating ram disposed in the elevating block 57 so as to freely advance and retract toward the port roll chock 40. 58 and a roll drive motor 59 for driving the advance / retreat ram 58. The port roll chock 40 can be moved horizontally by driving the roll drive motor 59 to advance and retract the advance / retreat ram 58.
[0025]
On the other hand, the roll driving unit lifting device 25 has the following configuration in the present embodiment.
That is, as shown in FIGS. 3 to 5, both side portions 60 of the elevating block 57 are slidably contacted with the inner surfaces of the rear horizontally long plates 23 and 24 before constituting the inner stand 12. On the other hand, a horizontally long closing flange 61 having a width wider than the width between the outer surfaces of the front and rear horizontally long plates 23 and 24 is connected to the outer end surface of the elevating block 57. The front and rear end portions of the front and rear flange plates 61 and 24 are respectively held in the vertical direction so as to hold the outer surfaces of the front and rear lateral plates 23 and 24 which are both side walls of the inner stand 12 forming the opening 14. The holding pieces 62 and 63 which are slidably contacted with each other are integrally connected.
[0026]
Further, a deformation preventing wedge 64 is interposed between the inner side surfaces of the holding pieces 62 and 63 and the outer side surfaces of the front and rear lateral plates 23 and 24, and is in a wedge fitting state. In this embodiment, the deformation preventing wedge 64 includes deformation preventing wedge pieces 64a and 64b each having a taper engagement surface. The deformation preventing wedge pieces 64a are outer surfaces of the front and rear lateral plates 23 and 24, respectively. Wedge piece for deformation prevention 64b Are attached to the inner surfaces of the holding pieces 62, 63.
[0027]
Further, a backlash absorbing wedge 68 is interposed between the inner end portions of the both side portions 60 of the elevating block 57 and the sliding guides 66 provided on the inner surfaces of the front and rear horizontal plates 23 and 24. In this embodiment, the backlash absorbing wedge 68 includes backlash absorbing wedge pieces 68a and 68b each having a taper engagement surface. The backlash absorbing wedge pieces 68a are the inner surfaces of the front and rear lateral plates 23 and 24, respectively. The backlash absorbing wedge piece 68b is attached to the lifting block 57.
[0028]
Further, a base portion of a lifting device support bracket 70 whose front portion extends to a position directly above the opening 14 of the inner stand 12 is attached to the left side portion of the upper horizontal frame 26 of the molding stand 11. And the roll drive part raising / lowering cylinder 71 is installed in the upper surface of the front part of the raising / lowering apparatus support bracket 70, The front part of the action | operation rod 72 is connected with the upper surface center part of the saddle roll drive part 20. FIG. In addition, a first drive unit lifting guide 73 that forms a pair at the front portion of the lifting device support bracket 70 at a predetermined distance in the front and rear directions around the operating rod 72 of the roll drive unit lifting cylinder 71. Are connected. On the other hand, on the upper surface of the elevating block 57 of the eaves roll drive unit 20, a second drive that forms a pair that can slide upward and downward along the inner surface of the first drive unit elevating guide 73 that forms the above-described pair. The base of the part raising / lowering guide 74 is attached.
[0029]
By driving the roll drive unit elevating cylinder 71 with the above-described configuration, the saddle roll drive unit 20 is smoothly and reliably moved to the upper position, which is the assembly entry / exitable position shown in FIG. 7, and the roll shown in FIG. It can move up and down between the lower position which is a drive position.
Further, as shown in FIG. 7, by driving the roll drive unit lifting device 25 and moving the roll drive unit 20 upward, the first drive unit lift guide 73 and the opening 14 of the inner stand 12 Since a sufficiently large roll assembly entry / exit space 82 can be formed between them, the entry / exit operation of the roll assembly 19 can be performed easily and reliably.
[0030]
The other configuration in the illustrated embodiment will be described. As shown in FIGS. 1 and 2, a roll replacement rail 76 having one end connected to the left side of the inner stand type rolling mill A on the roll replacement line 13. The roll replacement cylinder 75 is disposed on the extension line of the roll replacement rail 76. The rail end portion 76b that constitutes the other end of the roll replacement rail 76 is placed on a traverse table 76d that moves on a traverse rail 76c that is laid in a direction orthogonal to the roller replacement line 13. Further, a roll assembly traversing cylinder 76e is connected to the traversing base 76d.
[0031]
As shown in FIGS. 1 to 3, a saddle roll driving unit 77 for driving the starboard roll 18 is attached to the right end portion of the inner stand 12, and the saddle roll driving unit 77 is interposed via a power transmission shaft 78. The roll chock drive motor 79 attached to the upper horizontal frame 26 of the molding stand 11 is interlocked and connected.
Although not shown, the inner stand 12 is detachably connected to the molding stand 11, and the inner stand 12 itself can be pulled out via the roll exchange line 13 as necessary.
Further, although not shown, the inner stand 12 is provided with a clamp cylinder for fixing the upper and lower horizontal rolls 15 and 16 and the lower horizontal roll chock 38 and 39. A cotter device having a take-in / cylinder for clamping the left and starboard roll chocks 40 and 41 of the rolls 17 and 18 is attached. As shown in FIGS. 8 and 9, the cotter is configured to be fitted with sliding protrusions 80 and 81 attached to the side surfaces of the left and starboard rolls 17 and 18.
[0032]
Next, a procedure for taking out the roll assembly 19 from the inner stand type rolling mill A having the above-described configuration will be described with reference to FIGS. 1 and 2 in particular.
(Not shown) Each clamp cylinder of the upper clamp device is driven to pull back the clamp plate to release the clamped state of the upper and lower horizontal rolls 15, 16 and the lower horizontal roll chocks 38, 39, and the cotter device (not shown) Then, the cotter is pulled out from the sliding protrusions of the left and starboard rolls 17 and 18 and the starboard roll chock 40 and 41.
[0033]
Thereafter, the rolling device 30 and the rolling device 33 are driven, and the upper and lower horizontal rolls 15 and 16 and the left and starboard roll chocks 40 and 41 are moved from the forming position of the electric resistance welded tube to the original roll assembly takeout position. Let
By driving the rail lifting cylinder 37 and pushing up the rail 36, the roll assembly 19 is pushed up to the roll assembly replacement position.
[0034]
Thereafter, a roll exchange cylinder 75 provided on the extension of the roll exchange line 13 is driven, and the roll assembly 19 is pulled out from the inner stand 12 of the inner stand type rolling mill A. Transfer to the rail 76 and move to the roll exchange position. The roll assembly 19 is removed from the roll replacement rail 76, the new roll assembly 19 is placed on the roll replacement rail 76, the roll replacement cylinder 75 is driven again, and the roll assembly 19 is moved to the roll replacement position. Are inserted into the inner stand 12 of the inner stand type rolling mill A and assembled.
[0035]
As described above, the present invention has been described with reference to one embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and is described in the claims. Other embodiments that can be considered within the scope of the above (rolling equipment for shape steel, etc.) and modifications are also included.
[0036]
【The invention's effect】
In the inner stand type rolling mill according to any one of claims 1 to 4, while opening the opening of the inner stand, the upper position that allows the roll drive unit to be taken in and out of the inner stand of the roll assembly (the assembly can be moved in and out). Position) and a rectangular rigid frame in a plan view by closing the opening of the inner stand, and being able to move up and down between the lower position (roll driving position) where one of the left and starboard rolls can be driven. When replacing the roll, the inner stand is left in the molding stand, and only the roll assembly is taken out and reassembled. This eliminates the need for a plurality of inner stands conventionally required for one rolling mill, thereby saving space. This eliminates the need for handling the inner stand, reduces the number of workers, eliminates the need for skill, and reduces the weight of the offline remodeling cart. , It can greatly improve the workability of the reclassification truck because there is no inner stand.
[0037]
Especially in the inner stand type rolling mill according to claim 2 , Since the inner wall surface of the holding piece and the outer surfaces of the both side walls are wedge-fitted, it is possible to eliminate backlash at the fitting portion to prevent the inner stand from being deformed and to increase the rigidity of the inner stand.
[0038]
In the inner stand type rolling mill according to claim 3, a drive unit lifting device for raising and lowering the eaves roll drive unit and a drive unit elevating guide for elevating the eaves roll drive unit are disposed above the opening of the inner stand, A roll assembly body entry / exit space may be formed between the drive unit lifting guide and the opening of the inner stand. In this case, by driving the drive lifting device and moving the saddle roll drive unit upward, a sufficiently large roll assembly entry / exit space can be formed below the roll assembly drive unit. Work can be performed easily and reliably.
[0039]
In the inner stand type rolling mill according to claim 4, the inner stand can be taken out of the forming stand along the roll exchange line, so that even if the inner stand is damaged due to operation, the inner stand can be periodically removed. At the time of maintenance, the inner stand can be taken out of the molding stand without using a special jig.
[Brief description of the drawings]
FIG. 1 is a perspective view of an inner stand type rolling mill according to an embodiment of the present invention in which a roll assembly is incorporated.
FIG. 2 is a perspective view of an inner stand type rolling mill according to an embodiment of the present invention with a roll assembly taken out.
FIG. 3 is a front view of an inner stand type rolling mill according to an embodiment of the present invention in a state in which an opening on one side of the inner stand is closed by a saddle roll driving unit.
FIG. 4 is a side view of the same. It is.
FIG. 5 is a plan view of the same.
FIG. 6 is a perspective view of a main part of the lifting / lowering means of the reed roll drive unit.
FIG. 7 is a front view of an inner stand type rolling mill according to an embodiment of the present invention in a state where one side opening of the inner stand is opened.
FIG. 8 is an exploded perspective view of a roll assembly constituting a part of an inner stand type rolling mill according to an embodiment of the present invention.
FIGS. 9A and 9B are perspective views of the roll assembly constituting a part of the inner stand type rolling mill according to the embodiment of the present invention at the time of online reassignment and at the time of online set.
[Explanation of symbols]
A: Inner stand type rolling mill, 10: ERW production line, 11: Molding stand, 12: Inner stand, 13: Roll exchange line, 14: Opening, 15: Upper horizontal roll, 16: Lower horizontal roll, 17 : Left side roll, 18: starboard roll, 19: roll assembly, 20: side roll drive unit, 21: base plate, 22: front, rear column, 23: front horizontal plate, 24: rear horizontal plate, 25 : Roll drive unit elevating device, 26: Upper horizontal frame, 27: Suspension frame, 28, Roll chock suspension cylinder, 29: Actuating rod, 30: Reduction device, 30a: Reduction device drive motor, 31: Reduction block 32: Drive motor, 33: Lifting device, 34: Ram, 35: Rail lifting guide, 36: Rail, 37: Rail lifting cylinder, 38: Upper horizontal roll chock, 38 : Locking projection, 39: lower horizontal roll chock, 40: port roll chock, 41: starboard roll chock, 42: wheel, 43: rod mounting surface, 44: rod mounting surface, 45: support rod, 46: support Rod: 47: Rod insertion part, 48: Rod insertion part, 49: Chock support surface, 50: Rod contact block, 51: Rod contact block, 52: Support rod, 53: Support rod, 54: Rod insertion part, 55: Rod insertion part, 56: Chock support surface, 57: Lifting block, 58: Advance / retreat ram, 59: Roll drive motor, 60: Side part, 61: Closing flange, 62: Holding piece, 63: Holding piece 64: Deformation-preventing wedge, 64a: Deformation-preventing wedge piece, 64b: Deformation-preventing wedge piece, 66: Sliding guide, 68: Gutter absorbing wedge, 68a: Gutter-absorbing wedge piece, 68b: Wedge piece for backlash absorption, 70: Lifting device support bracket, 71: Roll driving unit lifting cylinder, 72: Actuating rod, 73: First driving unit lifting guide, 74: Second driving unit lifting guide, 75: Roll exchange cylinder, 76: Roll exchange rail, 76b: Rail end, 76c: Traverse rail, 76d: Traverse stand, 76e: Roll assembly traverse cylinder, 77: Roll drive unit, 78: Power transmission shaft, 79: Roll chock driving motor, 80: Sliding protrusion, 81: Sliding protrusion, 82: Roll assembly body entry / exit space

Claims (4)

A molding stand disposed on the production line of the ERW pipe and the shaped steel;
Built in the molding stand, has an opening on the side facing the roll exchange line arranged in a direction perpendicular to the electric sewing tube and shape steel production line, and constitutes a portal frame in plan view An inner stand,
A roll assembly that is assembled from upper, lower horizontal rolls, left and starboard rolls, and assembled between the roll assembly position and the roll exchange position on the roll exchange line.
Wherein opening the opening of the inner stand, constitutes the upper position to allow loading and unloading to the inner stand of the roll assembly, a rectangular rigid frame in a plan view by closing the opening portion of the inner stand, the left In an inner stand type rolling mill comprising a heel roll drive unit that is raised and lowered between a lower position that enables one of the starboard rolls to be driven ,
The eaves roll drive unit includes an elevating block that is slidable in an up-and-down direction within the opening of the inner stand, and a roll drive motor that is attached to the elevating block and advances and retracts one of the left and right side rolls. A pair of holding pieces which are integrally connected to both ends of the elevating block and whose inner surfaces form a pair that slidably contact with the outer surfaces of both side walls forming the opening of the inner stand in the vertical direction. An inner stand type rolling mill . 2. The inner stand type rolling mill according to claim 1, wherein an inner wall surface of the holding piece and an outer side surface of the both side walls of the saddle roll driving unit are in a wedge fitting state. 3. .   3. The inner stand type rolling mill according to claim 1, wherein a driving unit elevating device that elevates and lowers the eaves roll driving unit and an elevating unit that guides the elevating of the eaves roll driving unit above the opening of the inner stand. An inner stand type rolling mill characterized in that an elevating guide is disposed, and a roll assembly body entrance / exit space is formed between the driving unit elevating guide and the opening of the inner stand.   The inner stand type rolling mill according to any one of claims 1 to 3, wherein the inner stand is configured to be able to be taken out of the forming stand along the roll exchange line. Stand type rolling mill.

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